Audio Speed & Pitch Changer in your browser

Prepare and preview

Add a recording and select the section to export.

Set speed or a linked semitone preset; enable reverse if needed. Speed and pitch change together.

Check the output duration, prepare the preview and download MP3 or WAV.

Limits and output quality

Browser-supported MP3, WAV, M4A, AAC, OGG, FLAC and WebM inputs; mono or stereo only. One file up to 20 MB and two minutes of source audio. Output is limited to two minutes. Processing stays local at 44.1 kHz in a cancellable worker. WAV is 16-bit PCM. MP3 re-encoding is lossy, can add frame padding and may use a lower sample rate at low bitrates. Export metadata is not preserved. The encoder reduces gain when necessary to prevent sample clipping. Speed and pitch are linked resampling controls: 2× is one octave higher and 0.5× is one octave lower. Independent pitch shifting and pitch-preserving tempo changes are not offered. A windowed-sinc filter reduces resampling artifacts; processed audio can still sound different. Slowing down increases duration; trim the selection if output exceeds two minutes. Reverse changes playback direction after speed processing. Semitone values reflect the actual speed ratio.